package com.hongye.broker.util;

import cn.hutool.http.HttpUtil;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Base64;

public class Des {

    private final static String DES = "DES";

    //private final static String key = "3214324242332";

    public static void main(String[] args) {
        String encryptStr= encryptjm("hello des!","3214324242332");
        System.out.println("hello des!   ---->"+encryptStr);
        String decStr=decryptjm(encryptStr,"3214324242332");
        System.out.println(encryptStr+" ---->"+decStr);

    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param //key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    public static String encryptjm(String data,final String key)  {
        byte[] bt = new byte[0];
        try {
            bt = encrypt(data.getBytes(), key.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        //Base64.getEncoder() jdk8
        String strs = Base64.getEncoder().encodeToString(bt);//encodeBase64String(bt);
        //String strs = new BASE64Encoder().encode(bt);
        // String strs = new Base64Encoder().encode(bt);
        return strs;
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * //@param key
     *            加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decryptjm(String data,final String key)  {
        if (data == null)
            return null;
        // byte[] buf = Base64.decodeBase64(data);
        byte[] buf =  Base64.getDecoder().decode(data);

        byte[] bt = new byte[0];
        try {
            bt = decrypt(buf, key.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return new String(bt);
    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }


}